Subsequent Event (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions	Oct. 31, 2018	Oct. 18, 2018	Jul. 11, 2018
Land Drilling Rigs
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration			$ 287.5
Escrow Deposit Liability			$ 43.0
Subsequent Event | Laboratory Service Business
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 205.0
Subsequent Event | Land Drilling Rigs
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses	$ 123.0